One, new application
Gravity is suitable for treatment of useful minerals and gangue with larger density difference between the mineral or other materials. It was, in fine grain and coarse grain ( approximately boundaries is greater than 25 mm,2mm,25" - 2 - O.1mm ) ore effective method. In the processing of fine slime ( less than 0.1 mm) when efficiency is not high, the modern flow membrane separation equipment effective recycling particle to the 20-30microns, centrifugal concentration machine can be up to 10 microns.
Gravity separation is processing tungsten, tin, gold ore, especially the processing of placer tin ore, the traditional method. In the treatment of rare metals ( titanium, zirconium, niobium, tantalum, etc.) are also common in the placer application. Gravity separation is also used in separating weak magnetic iron ore, manganese ore, chrome ore.
In coal preparation industry is main method. In recent years in non metallic mineral processing industry. Also obtained the development, mainly for the handling of asbestos, diamond, kaolin, apatite, pyrite and other minerals. In selecting copper, lead, zinc, antimony, mercury sulphide ore flotation plant. Often use a gravity separation method for ore preconcentration. In the main flow of gravity and other mineral processing component of the joint process, to advance in the coarse-grained state elected to concentrate or tailing.
This will be beneficial to reduce the production cost and reduce the loss of metal. When processing a ore has a variety of methods are available, gravity method is preferred.
Gravity separation in a fluid medium, the medium used is typically water, sometimes with air dense medium ( or heavy liquid or suspension). Medium in sorting equipment in a certain manner of motion. Mineral particle by the media of the buoyancy and the hydrodynamic effects of loose, then according to the density (and sometimes by particle size ) differential layer. Effects of stratification process of mineral particle nature is its density, particle size and a secondary shape factors.
According to the movement of the medium form and operation of the purpose, there are several methods:
(2) the heavy medium separation
(3) jigging separation
(5) chute ore dressing
(6) spiral concentrator
(7) centrifugal force concentrator
(8) wind concentrator
(9) the ore washing